1. Stormwater Management
Regulation Roll Out
Regional Outreach
Meeting
Front Royal, VA
August 6, 2012
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2. Presenters & Agenda
• Introductions – Ginny Snead, PE; Office of
Regulatory Programs Manager
• Stormwater Regulatory Overview &Update -
Ginny Snead, PE
• Local SWM Program Elements & Tools –
Joan Salvati, Guidance and Program
Development Manager
• Virginia E-Permitting - Gerry Seeley, DCR
Website Development Coordinator
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3. Commonwealth of Virginia
Stormwater Regulatory Update
Ginny Snead, PE
Office of Regulatory Programs Manager
July 17, 2012
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4. Office of Regulatory Programs
Regulation Applicability threshold
• Erosion & Sediment Control Act 10,000 sq ft
• Chesapeake Bay Preservation Act 2,500 sq ft
• VA SW Management Permit (VSMP) 1 acre
– Construction General Permit
• Municipal Separate Storm Sewer
System (MS4)
– Phase I Individual Permits
– Phase II (Small) General Permit
• Chesapeake Bay Total Maximum
Daily Load (TMDL) Watershed
Implementation Plan (WIP) 4

5. Virginia Stormwater
Management Program (VSMP)
• Currently State Run
• Compliance = Water Quality
– Current Compliance @ 40%
– Local vs. State confusion
• Simplification: Local Programs = Local Control
= Improved Compliance
• Consistency: Facilitates uniform program
oversight and enforcement. 5

6. VSMP Regulations Timeline
• Virginia Soil and Water Conservation
Board adopted regulations May 24,
2011
• Regulations became effective
September 13, 2011 and Published
on DCR website
• Implementation date = July 1, 2014
through State Construction General
Permit and Local Ordinances
• Before July 1, 2014, Local Gov’ts
Develop and Adopt Ordinances and
Programs
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7. Statewide Implementation
Chesapeake Bay Preservation Act localities and Municipal Separate
Storm Sewer System (MS4) permitted localities
Likely that no stormwater program exists currently (but do have E&S)
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8. Program Development Timeline
• Regulations effective September 13, 2011
• Local program development timeframe
January through June 2013 (15 - 21 months of
effective date of regulations)
– One year extension to July 1, 2014
– Compliance = Water Quality Protection
• Local Program Development NOW
– Outreach, Outreach, Outreach
– Tool Development
– Stormwater Local Government Advisory Committee
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(SLGAC)

9. Local Program Benefits
• Developers
– Eliminates local vs. state
confusion
– More effective options
– Greater compliance=better
protection of local natural
resources
• Local Control
– Speed of plan review and
approval
– Economic development
advantage
– Address local issues 9

10. DCR Assistance Timeline
• Establish Local Government
Advisory Team – Began March 2012
• Program Requirement Checklist –
Final May 2012
• Model Ordinance development –
underway (end of summer)
• Training Plan
• Administrative Tools
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11. Relevant 2012 Legislation
• Budget (local financial assistance)
• Integration Bill (HB1065, SB407)
– Statewide Reach and Streamlines Programs
• Nutrient Trading Bill (HB176, SB77)
– Expansion of Current Programs
• CAFOs, MS4s, Industrial SW
– Cost Effective Compliance
– Stormwater Offsets
• Necessitates several exempt regulatory actions 11

12. General Permit Reissuance
• Small MS4 General Permit
– RAP Meetings June, July, August
– Proposed Regs to Board this
September (2012)
– Effective July 2013
• Construction General Permit
– May 21 - June 20 Initial Public Comment
– RAP Meetings August, September, October
– Proposed Regs to Board December 2012
– Effective July 2014 12

13. Question and Answer
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14. Introducing Runoff Volume Reduction
• The Virginia Runoff Reduction
Method (RRM) was developed by the
Center for Watershed Protection (CWP)
and the Chesapeake Stormwater
Network (CSN) for DCR.
• The method focuses on determining a
BMPs' capacity to capture/reduce the
overall volume of runoff as well as mass
pollutant removal. Goal = mimic pre-
development site hydrology.
• The method also incorporates built-in
incentives for forest preservation and
the minimization of impervious surfaces.
• The RRM is a tool for planning and
measuring compliance. It is not a
design tool. 14

15. • “Traditional” BMP pollutant removal efficiencies do not take
into account the removal that occurs when the runoff
volume is reduced.
• Many BMPs, such as ponds and filters, do not reduce
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runoff volume at all.

16. • Using BMPs that also provide volume reduction provides greater
overall pollutant (mass load) removal
• This reflects a “Mass Balance” Approach 16

17. The Key Differences in Application
Existing Rules Modified Rules
Impervious Surface Land Use(s) IC + Forest/Open Space
(IC) only + Managed Turf
0.5 inches of Runoff Event 1.0 inches of Rainfall
from the IC only from the whole site
Average land condition/ 0.41 lbs./ac/yr TP
New Design Criteria
technology based
10% reduction TP Redevelopment <1 acre = 10% red. TP,
Criteria >1 acre = 20% red. TP
Compliance Runoff Reduction Method
Simple Method
Methodology (RRM = enhanced
Simple Method)
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18. 0.41 lbs/ac/yr Total Phosphorus Threshold
associated with the Impervious Cover Model
Statewide requirement based on three types of land cover and NRCS hydrologic
soil groups of soil on site
Threshold assumes 10% impervious cover, 30% turf, 60% forest
The Impervious Cover Model focuses on protecting water quality
in local streams.
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19. Use Environmental Site Design
(Think about this early in the design process)
• Fit the design to
terrain
• Locate development in
less sensitive areas
• Reduce the limits of
clearing and grading
• Use open space
design (clustering)
techniques
• Reduce impervious
cover
If designers wait until site plans are completed and then apply
SWM solutions afterwards, SWM solutions are likely to be more
constrained, less effective, and more costly.
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20. Typical Development Site Plan
15 Acres
25 0.6 acre lots
Treatment Volume = 18,100 cubic feet
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21. Example Runoff Reduction Site Plan
15 Acres
25 ¼ acre lots
Treatment Volume = 13,600 cubic feet
25% reduction before BMPs applied
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22. Water Quantity Control
The new paradigm is Volume-Based Hydrology (VBH),
focused on:
Volume
Peak Flow
Velocity
Flooding
22

23. Channel Protection Criteria are now
Situational
Manmade Stormwater Conveyance Systems
Restored Stormwater Conveyance Systems
Natural Stormwater Conveyance Systems
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24. The Energy Balance Method
• The new ENERGY
BALANCE METHOD
is based on the
interaction of both flow
volume and peak
discharge, which
determine the stream
channel configuration
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25. Runoff Reduction Method Spreadsheet
Compliance tool, NOT a
design tool:
• Calculates treat. volume &
pollutant reduction requirement
• Tracks & totals BMP pollutant
removals
• CN adjustments for quantity
control
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26. Grandfathered Projects (4 VAC 50-60-48)
Land-disturbing activities where the following was approved
by a locality prior to July 1, 2012:
– a currently valid proffered or conditional zoning plan,
–preliminary or final subdivision plat,
–preliminary or final site plan or
–zoning with a plan of development,
–or any document determined by the locality as being equivalent
and
–Coverage under the Virginia Stormwater Management Program
(VSMP) General Permit was not obtained prior to July 1, 2014.
The land disturbance activity must be complete by June 30,
2019 or portions not under construction shall become
subject to the new regulatory design criteria.
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27. Grandfathered Local, State and
Federal Projects
A local, state or federal project is grandfathered until June
30, 2019 when:
There has been an obligation of locality, state, or federal funding,
in whole or in part, prior to July 1, 2012, or for which the
department has approved a stormwater management plan prior
to July 1, 2012
Additional discussion is required on what this means
for state college and university master plans.
If bonds or public debt financing has been secured prior to
July, 1 2012, projects shall be grandfathered
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28. Time Limit on Applicability of Approvals
(4 VAC 50-60-47.1)
The approved post-development SWM design is valid for
construction only for the remaining portion of the General
Permit cycle under which it was originally permitted (up to
5-years) PLUS two additional permit cycles (10-years)
unless:
VSMP permit coverage lapses (failure to reapply)
or
Two additional permit cycles have passed
In that event, portions of the project not under construction
are required to meet any new technical criteria adopted
since the original permit coverage was issued.
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29. Example Time Limit on an Approved Plan
A subdivision registers under the
VSMP General Permit on July 12,
2013.
The post-development criteria
applicable to the subdivision
remains applicable for the
remaining portion of that permit
cycle (until 2014) plus two additional
permit cycles (2014-19, 2019-24).
Any portions of the sub-division not
under construction by July 1, 2024
must meet the post-development
design criteria in the regulations at
that time.
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30. Resources Available in the New (Revised
and Updated) Virginia Stormwater
Management Handbook
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31. Background
• The existing Virginia SWM Handbook (nicknamed
the “Blue Book”) was released in 1999.
• Many new technologies, practices, and design
techniques developed since then, but NOT
reflected in the existing Handbook.
• New Handbook reflects quantum leaps in
research and in knowledge of how to do SWM
well.
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32. Handbook Organization
• The Handbook organized in 3 Parts.
– Part 1: Laws, Regulations and Program Implementation
(Chapters 1-3)
– Part 2: Understanding Stormwater Management
(Chapters 4-7)
– Part 3: Tools, Methods and Examples (Chapters 8-14)
• Most chapters have multiple Appendices that
provide specific guidance, useful tools, case
studies, etc.
• Handbook has many more helpful photos and
graphics.
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33. Virginia Stormwater BMP Clearinghouse
Design standards and specifications of BMPs approved for
use in Virginia to control the quality and/or quantity of
stormwater runoff.
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34. Traditional Runoff Treatment BMPs
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35. Runoff Volume Reduction/LID BMPs
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36. Manufactured (Proprietary) BMPs
Clearinghouse website disseminates the results of Virginia’s process to evaluate
and certify the performance claims of manufactured/proprietary BMPs using the
Virginia Technology Assessment Protocol (VTAP) 36

37. LEED Credits for BMP Use
• Site Reforestation: SS5.1, SS5.2, SS6.2; maybe SS7.1, WE1.1, WE1.2
• Rooftop Disconnection: SS6.1, SS6.2; maybe WE1.1, WE1.2
• Filter Strips: SS5.2, SS6.1, SS6.2; maybe WE1.1, WE1.2
• Grass Channel: SS5.1, SS5.2, SS6.1, SS6.2
• Vegetated Roofs: EA pre-1 & EA1; maybe SS5.1 and/or SS5.2 if get SS2; maybe SS6.1,
SS6.2, SS7.1, WW7.2
• Rainwater Harvesting: SS6.1, SS6.2, WE1.1 & WE1.2 or WE2 or WE3
• Permeable Pavement: SS6.1, SS6.2; maybe SS5.1, SS7.1, WE credits, MR credits
• Infiltration: SS6.1, SS6.2
• Bioretention: SS5.1, SS5.2, SS6.1, SS6.2, WE1.1, WE1.2
• Wet Swale/Wet Ponds: SS5.1; maybe SS5.2, SS6.1, SS6.2
• Filtering Practices: SS6.2; maybe SS5.1, SS6.1
• Constructed Wetlands: SS5.1; maybe SS5.2, SS6.1, SS6.2
KEY: SS = sustainable sites; WE = water efficient landscaping;
EA = energy and atmosphere; MR = materials and resources
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38. Additional Information
Draft Stormwater Handbook
http://www.dcr.virginia.gov/lr2i.shtml
BMP Clearinghouse Website
http://vwrrc.vt.edu/swc/
Runoff Reduction Methodology
http://www.dcr.virginia.gov/lr2f.shtml
Modified Regulations
http://lis.virginia.gov/000/reg/TOC04050.HTM#C0060
Stormwater Local Government Advisory Committee
(SWLGAC) Information
http://www.dcr.virginia.gov/lrswlgac01.shtml
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39. RRM on DCR Website
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40. 40

41. QUESTIONS?
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